2 * swift implementation of syscall API
4 * Simulates the classic socket syscalls (socket, bind, send, recv).
5 * Implementation uses raw sockets (AF_INET, SOCK_RAW).
7 * Subsequently, implementation is to be ported into kernel space and
8 * the interface is going to be offered by the Linux syscall API.
10 * Heavily inspired by GLIBC's <sys/socket.h>
11 * (/usr/include/sys/socket.h).
13 * 2011, Razvan Deaconescu, razvan.deaconescu@cs.pub.ro
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
25 #include "swift_types.h"
26 #include "swift_raw.h"
27 #include "swift_list.h"
32 * Create a new socket of type TYPE in domain DOMAIN, using
33 * protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically.
34 * Returns a file descriptor for the new socket, or -1 for errors.
36 * swift: PROTOCOL is IPPROTO_SWIFT. Ignore TYPE.
38 int sw_socket(int __domain, int __type, int __protocol)
41 struct sock_list *list;
43 if (__domain != PF_INET || __type != SOCK_DGRAM || __protocol != IPPROTO_SWIFT) {
48 s = socket(PF_INET, SOCK_RAW, IPPROTO_SWIFT);
53 list = list_add_socket(s);
59 /* Socket is not bound. */
60 list->bind_state = STATE_NOTBOUND;
71 * Give the socket FD the local address ADDR (which is LEN bytes long).
73 * swift: ADDR is of type struct sockaddr_sw.
75 int sw_bind(int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len)
77 struct sock_list *list;
80 rc = list_socket_is_bound(__fd);
83 goto socket_bound_err;
86 /* Check whether address is already in use. */
87 list = list_elem_from_address(__addr);
93 /* Update __fd entry in socket management list. */
94 list = list_update_socket_address(__fd, __addr);
108 /* Put the local address of FD into *ADDR and its length in *LEN. */
109 int sw_getsockname(int __fd, __SOCKADDR_ARG __addr,
110 socklen_t *__restrict __len)
112 struct sock_list *list;
114 /* Find socket in management structure. */
115 list = list_elem_from_socket(__fd);
121 memcpy(__addr, &list->addr, sizeof(list->addr));
122 *__len = sizeof(list->addr);
131 * Send N bytes of BUF on socket FD to peer at address ADDR (which is
132 * ADDR_LEN bytes long). Returns the number sent, or -1 for errors.
134 * This function is a cancellation point and therefore not marked with
137 ssize_t sw_sendto(int __fd, __const void *__buf, size_t __n,
138 int __flags, __CONST_SOCKADDR_ARG __addr,
139 socklen_t __addr_len)
142 struct sock_list *list;
143 struct iovec __iov[1];
144 struct msghdr __msgh;
145 struct sockaddr_sw *__sw_addr = (struct sockaddr_sw *) __addr;
147 list = list_elem_from_socket(__fd);
148 if (list != NULL && list->bind_state == STATE_NOTBOUND) {
149 errno = EAFNOSUPPORT;
154 char str[INET_ADDRSTRLEN];
156 inet_ntop(AF_INET, &(__sw_addr->sin_addr), str, INET_ADDRSTRLEN);
157 printf("=== ADDR: %s ===\n", str);
160 /* Specify the components of the message in an "iovec". */
161 __iov[0].iov_base = (void *) __buf;
162 __iov[0].iov_len = __n;
164 /* The message header contains parameters for sendmsg. */
165 __msgh.msg_name = (caddr_t) __addr;
166 __msgh.msg_namelen = sizeof(__addr);
167 __msgh.msg_iov = __iov;
168 __msgh.msg_iovlen = 1;
169 __msgh.msg_control = NULL; /* irrelevant to AF_INET */
170 __msgh.msg_controllen = 0; /* irrelevant to AF_INET */
172 return sendmsg(__fd, &__msgh, 0);
179 * Read N bytes into BUF through socket FD.
180 * If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
181 * the sender, and store the actual size of the address in *ADDR_LEN.
182 * Returns the number of bytes read or -1 for errors.
184 * This function is a cancellation point and therefore not marked with
187 ssize_t sw_recvfrom(int __fd, void *__restrict __buf, size_t __n,
188 int __flags, __SOCKADDR_ARG __addr,
189 socklen_t *__restrict __addr_len)
192 struct sock_list *list;
193 struct iovec __iov[1];
194 struct msghdr __msgh;
195 struct sockaddr_sw *__sw_addr = (struct sockaddr_sw *) __addr;
197 list = list_elem_from_socket(__fd);
198 if (list != NULL && list->bind_state == STATE_NOTBOUND) {
199 errno = EAFNOSUPPORT;
205 return recvmsg(__fd, &__msgh, 0);
212 * Send a message described MESSAGE on socket FD.
213 * Returns the number of bytes sent, or -1 for errors.
215 * This function is a cancellation point and therefore not marked with
218 ssize_t sw_sendmsg(int __fd, __const struct msghdr *__message,
225 return sendmsg(__fd, __message, __flags);
229 * Receive a message as described by MESSAGE from socket FD.
230 * Returns the number of bytes read or -1 for errors.
232 * This function is a cancellation point and therefore not marked with
235 ssize_t sw_recvmsg(int __fd, struct msghdr *__message, int __flags)
241 return recvmsg(__fd, __message, __flags);
245 * Put the current value for socket FD's option OPTNAME at protocol level
246 * LEVEL into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the
247 * value's actual length. Returns 0 on success, -1 for errors.
249 int sw_getsockopt(int __fd, int __level, int __optname,
250 void *__restrict __optval,
251 socklen_t *__restrict __optlen)
253 /* Call classical interface of getsockopt(2). */
254 return getsockopt(__fd, __level, __optname, __optval, __optlen);
258 * Set socket FD's option OPTNAME at protocol level LEVEL
259 * to *OPTVAL (which is OPTLEN bytes long).
260 * Returns 0 on success, -1 for errors.
262 int sw_setsockopt(int __fd, int __level, int __optname,
263 __const void *__optval, socklen_t __optlen)
265 /* Call classical interface of setsockopt(2). */
266 return setsockopt(__fd, __level, __optname, __optval, __optlen);
270 * Close file descriptor for socket FD.
271 * Returns 0 on success, -1 for errors.
273 int sw_close(int __fd)
277 /* Remove socket from socket management structure. */
278 rc = list_remove_socket(__fd);
281 goto list_unlink_err;
284 /* Call classical interface of close(2). */